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Options in defining KSDS

 
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ravikumar15

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Joined: 27 Mar 2006
Posts: 64

PostPosted: Tue May 16, 2006 3:03 pm    Post subject: Options in defining KSDS
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While defining a KSDS cluster, I saw an option called 'SPEED'. Can any one tell me the significance of this option.

Thanks,
Ravi
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rajandhla

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Joined: 18 Oct 2005
Posts: 182
Location: Luton UK

PostPosted: Tue May 16, 2006 3:46 pm    Post subject: Re: Options in defining KSDS
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SPEED|RECOVERY
specifies whether the data component's control areas are to be
preformatted before alternate index records are loaded into them.

When you specify RECOVERY, your initial load takes longer because the
control areas are written initially with end-of-file indicators and
again with your alternate index records. When you specify SPEED, your
initial load is quicker.

SPEED
specifies that the data component's space is not to be
preformatted. Its space might contain data records from a
previous use of the space, or it might contain binary zeros; its
contents are unpredictable.

If the initial load fails, you must load the alternate index
records again from the beginning because VSAM is unable to
determine where your last correctly written record is. VSAM
cannot find a valid end-of-file indicator when it searches your
alternate index records.

RECOVERY
specifies that the data component's control areas are written with
records that indicate end-of-file. When an alternate index record
is written into a control interval, it is always followed by a
record that identifies the record that has just been written as
the last record in the alternate index.

If the initial load fails, you can resume loading alternate index
records after the last correctly written record, because an
end-of-file indicator identifies it as the last record.


Hope this helps

Regards
jai
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